[WIP] Raw User Input: /project/metadata route

[Copilot]

Adding middleware to protect /project/metadata route from malicious user input.

Plan for implementing the checkIfSuspicious middleware:

• Analyze the current /project/metadata route structure (lines 571-595 in project/index.js)
• Examine existing input validation patterns in the codebase
• Review current middleware patterns (auth0Middleware)
• Create the checkIfSuspicious.js middleware in utilities directory
• Implement input validation for metadata arrays with 'label' and 'value' properties
• Add the middleware to the PUT /project/metadata route
• Test the implementation to ensure it works correctly
• Verify no existing functionality is broken

Current route accepts metadata as req.body (array of objects) and passes it directly to projectObj.updateMetadata() without validation. The middleware will sanitize/validate this input before processing.

Fixes #314.

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